Equilibrium and kinetic study for the reaction of Trans-K[Cr(ox}z(H20)2).3Hz0 with 4-aminoantipyrine
A new complex of Cr(UI) has been prepared. The kinetics and eqailibrium study of the substitution reaction for the complex Trans KfCr(ox)z(H 0)2].3l--h0 {T I }, with 4-aminoantipyrine {AAP}, bave been per£Qrm d in aqueous media at .(pH. = 4.9, 5.6 and 6.0) (!!?0.4M NaN03). Activation pararrieters for the reac(ions are {Eat= l.89l kCal
mor 1 , l:t=89.29 kCal mo1"1 and t\S 1 = 0.281 Cal. mor1) and
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(Ea2=0.487kCal mort, .1\Ht!=6..2.Cl3 kCal mort and t1S 2 = -92.8 Cal mor
). The observed rate constants are in good agreement with substitution
rea<;;tion of the C<,)mplex with amino acids( J) and other anions(2).